Rf4 is a useful alternative, with the double threat to e4 and h2 After 2 h3 Bxe4 Black wins the white queen, but male in three moves is better. 52. (Slade-Hooper) 1 . Nxd3 2cxd3Qxh2+ 3Qxh2 Nf2 mate The first move is line opening (a diagonal is a line too , then a deflection, and, at last, the purpose of it all, the beloved classic, the smothered mate, 53. (de Bondt-Seele) Rg4 and Kg8 are at the spacing of a knight fork, so 1 Rxf6 gxf6 2 Qxg4 Black sees the back-rank threat...